diff options
Diffstat (limited to 'arch/loongarch')
| -rw-r--r-- | arch/loongarch/Kconfig | 3 | ||||
| -rw-r--r-- | arch/loongarch/kernel/asm-offsets.c | 12 | ||||
| -rw-r--r-- | arch/loongarch/kernel/reset.c | 5 | ||||
| -rw-r--r-- | arch/loongarch/kernel/setup.c | 5 | ||||
| -rw-r--r-- | arch/loongarch/power/Makefile | 1 | ||||
| -rw-r--r-- | arch/loongarch/power/hibernate.c | 62 | ||||
| -rw-r--r-- | arch/loongarch/power/hibernate_asm.S | 66 |
7 files changed, 154 insertions, 0 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 0c8b2b1a9626..576a649ac13c 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -521,6 +521,9 @@ menu "Power management options" config ARCH_SUSPEND_POSSIBLE def_bool y +config ARCH_HIBERNATION_POSSIBLE + def_bool y + source "kernel/power/Kconfig" source "drivers/acpi/Kconfig" diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c index bdd88eda9513..4ef494577813 100644 --- a/arch/loongarch/kernel/asm-offsets.c +++ b/arch/loongarch/kernel/asm-offsets.c @@ -257,3 +257,15 @@ void output_smpboot_defines(void) BLANK(); } #endif + +#ifdef CONFIG_HIBERNATION +void output_pbe_defines(void) +{ + COMMENT(" Linux struct pbe offsets. "); + OFFSET(PBE_ADDRESS, pbe, address); + OFFSET(PBE_ORIG_ADDRESS, pbe, orig_address); + OFFSET(PBE_NEXT, pbe, next); + DEFINE(PBE_SIZE, sizeof(struct pbe)); + BLANK(); +} +#endif diff --git a/arch/loongarch/kernel/reset.c b/arch/loongarch/kernel/reset.c index 8c82021eb2f4..1ef8c6383535 100644 --- a/arch/loongarch/kernel/reset.c +++ b/arch/loongarch/kernel/reset.c @@ -15,6 +15,7 @@ #include <acpi/reboot.h> #include <asm/idle.h> #include <asm/loongarch.h> +#include <asm/loongson.h> void (*pm_power_off)(void); EXPORT_SYMBOL(pm_power_off); @@ -42,6 +43,10 @@ void machine_power_off(void) preempt_disable(); smp_send_stop(); #endif +#ifdef CONFIG_PM + if (!acpi_disabled) + enable_pci_wakeup(); +#endif do_kernel_power_off(); #ifdef CONFIG_EFI efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL); diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c index fdabf2ac1927..4344502c0b31 100644 --- a/arch/loongarch/kernel/setup.c +++ b/arch/loongarch/kernel/setup.c @@ -31,6 +31,7 @@ #include <linux/libfdt.h> #include <linux/of_fdt.h> #include <linux/of_address.h> +#include <linux/suspend.h> #include <linux/swiotlb.h> #include <asm/addrspace.h> @@ -370,6 +371,10 @@ static void __init arch_mem_init(char **cmdline_p) dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); + /* Reserve for hibernation. */ + register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)), + PFN_UP(__pa_symbol(&__nosave_end))); + memblock_dump_all(); early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); diff --git a/arch/loongarch/power/Makefile b/arch/loongarch/power/Makefile index 6740117decaa..58151d003e40 100644 --- a/arch/loongarch/power/Makefile +++ b/arch/loongarch/power/Makefile @@ -1,3 +1,4 @@ obj-y += platform.o obj-$(CONFIG_SUSPEND) += suspend.o suspend_asm.o +obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o diff --git a/arch/loongarch/power/hibernate.c b/arch/loongarch/power/hibernate.c new file mode 100644 index 000000000000..1e0590542f98 --- /dev/null +++ b/arch/loongarch/power/hibernate.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <asm/fpu.h> +#include <asm/loongson.h> +#include <asm/sections.h> +#include <asm/tlbflush.h> +#include <linux/suspend.h> + +static u32 saved_crmd; +static u32 saved_prmd; +static u32 saved_euen; +static u32 saved_ecfg; +static u64 saved_pcpu_base; +struct pt_regs saved_regs; + +void save_processor_state(void) +{ + saved_crmd = csr_read32(LOONGARCH_CSR_CRMD); + saved_prmd = csr_read32(LOONGARCH_CSR_PRMD); + saved_euen = csr_read32(LOONGARCH_CSR_EUEN); + saved_ecfg = csr_read32(LOONGARCH_CSR_ECFG); + saved_pcpu_base = csr_read64(PERCPU_BASE_KS); + + if (is_fpu_owner()) + save_fp(current); +} + +void restore_processor_state(void) +{ + csr_write32(saved_crmd, LOONGARCH_CSR_CRMD); + csr_write32(saved_prmd, LOONGARCH_CSR_PRMD); + csr_write32(saved_euen, LOONGARCH_CSR_EUEN); + csr_write32(saved_ecfg, LOONGARCH_CSR_ECFG); + csr_write64(saved_pcpu_base, PERCPU_BASE_KS); + + if (is_fpu_owner()) + restore_fp(current); +} + +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin)); + unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end)); + + return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn); +} + +extern int swsusp_asm_suspend(void); + +int swsusp_arch_suspend(void) +{ + enable_pci_wakeup(); + return swsusp_asm_suspend(); +} + +extern int swsusp_asm_resume(void); + +int swsusp_arch_resume(void) +{ + /* Avoid TLB mismatch during and after kernel resume */ + local_flush_tlb_all(); + return swsusp_asm_resume(); +} diff --git a/arch/loongarch/power/hibernate_asm.S b/arch/loongarch/power/hibernate_asm.S new file mode 100644 index 000000000000..3c747c08d65d --- /dev/null +++ b/arch/loongarch/power/hibernate_asm.S @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Hibernation support specific for LoongArch + * + * Author: Huacai Chen <chenhuacai@loongson.cn> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ +#include <linux/linkage.h> +#include <asm/asm.h> +#include <asm/asm-offsets.h> +#include <asm/regdef.h> + +.text +SYM_FUNC_START(swsusp_asm_suspend) + la.pcrel t0, saved_regs + PTR_S ra, t0, PT_R1 + PTR_S tp, t0, PT_R2 + PTR_S sp, t0, PT_R3 + PTR_S u0, t0, PT_R21 + PTR_S fp, t0, PT_R22 + PTR_S s0, t0, PT_R23 + PTR_S s1, t0, PT_R24 + PTR_S s2, t0, PT_R25 + PTR_S s3, t0, PT_R26 + PTR_S s4, t0, PT_R27 + PTR_S s5, t0, PT_R28 + PTR_S s6, t0, PT_R29 + PTR_S s7, t0, PT_R30 + PTR_S s8, t0, PT_R31 + b swsusp_save +SYM_FUNC_END(swsusp_asm_suspend) + +SYM_FUNC_START(swsusp_asm_resume) + la.pcrel t0, restore_pblist + PTR_L t0, t0, 0 +0: + PTR_L t1, t0, PBE_ADDRESS /* source */ + PTR_L t2, t0, PBE_ORIG_ADDRESS /* destination */ + PTR_LI t3, _PAGE_SIZE + PTR_ADD t3, t3, t1 +1: + REG_L t8, t1, 0 + REG_S t8, t2, 0 + PTR_ADDI t1, t1, SZREG + PTR_ADDI t2, t2, SZREG + bne t1, t3, 1b + PTR_L t0, t0, PBE_NEXT + bnez t0, 0b + la.pcrel t0, saved_regs + PTR_L ra, t0, PT_R1 + PTR_L tp, t0, PT_R2 + PTR_L sp, t0, PT_R3 + PTR_L u0, t0, PT_R21 + PTR_L fp, t0, PT_R22 + PTR_L s0, t0, PT_R23 + PTR_L s1, t0, PT_R24 + PTR_L s2, t0, PT_R25 + PTR_L s3, t0, PT_R26 + PTR_L s4, t0, PT_R27 + PTR_L s5, t0, PT_R28 + PTR_L s6, t0, PT_R29 + PTR_L s7, t0, PT_R30 + PTR_L s8, t0, PT_R31 + PTR_LI a0, 0x0 + jirl zero, ra, 0 +SYM_FUNC_END(swsusp_asm_resume) |